<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>条件渲染</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <button @click="toggle">toggle</button>
    <h1 v-if="awesome">Vue is awesome!</h1>
    <h1 v-else>Oh no 😢</h1>
  </div>
  <script>
    new Vue({
      el: '#app',
      data: {
        awesome: true
      },
      methods: {
        toggle() {
          this.awesome = !this.awesome
        }
      }
    })
  </script>
</body>
</html>